formant /förˈmənt/

1. A component of a speech sound determining its particular quality (acoustics)
2. Anything that determines, limits or defines

• underfelts
• underfinished
• under fire
• underfire
• underfired
• underfires
• underfiring
• underfish
• underfished
• underfishes
• underfishing
• underfloor
• underflow
• underflows
• underfong
• underfonged
• underfonging
• underfongs
• underfoot
• underfooted
• underfooting
• underfoots
• underframe
• underframes
• underfulfil